Finding the Fourth Proportional to 21,667.77, 32,475.08 and 12,315.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,667.77 : 32,475.08 = 12,315.63 : x
2. Step 2: Convert to fraction form
   21,667.77/32,475.08 = 12,315.63/x
3. Step 3: Cross multiply
   21,667.77x = 32,475.08 × 12,315.63
4. Step 4: Simplify right side
   21,667.77x = 399,950,845.55
5. Step 5: Solve for x
   x = 399,950,845.55/21,667.77
6. Step 6: Final answer
   x = 18,458.33